function TreeNode(val) {
    this.val = val
    this.left = null
    this.right = null
}

var pathSum = function(root, target) {
    // 最终返回的数组
    let result = []
    // 过渡数组
    let temp = []
    let sum = 0
    function backtrack(root) {
        if (root == null) {

        }

    }
};
